Transcription of 3.2.2 Rational Method - CECALC.com
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3.2.2 Rational Method - CECALC.com
3-5 Rational Method One of the most commonly used equations for the calculation of peak flow from small areas is the Rational formula, given as: Q = (CIA)/Ku (3-1) where: Q = Flow, m3/s (ft3/s) C = Dimensionless runoff coefficient I = Rainfall intensity, mm/hr (in/hr) A = Drainage area, hectares, ha (acres) Ku = Units conversion factor equal to 360 ( in English Units) Assumptions inherent in the Rational formula are as follows:(6) Peak flow occurs when the entire watershed is contributing to the flow. Rainfall intensity is the same over the entire drainage area. Rainfall intensity is uniform over a time duration equal to the time of concentration, tc. The time of concentration is the time required for water to travel from the hydraulically most remote point of the basin to the point of interest. Frequency of the computed peak flow is the same as that of the rainfall intensity, , the 10-year rainfall intensity is assumed to produce the 10-year peak flow.
3-5 3.2.2 Rational Method One of the most commonly used equations for the calculation of peak flow from small areas is the Rational formula, given as:
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